package com.mystatusonline.webapp.util;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;


/**
 * Convenience class for setting and retrieving cookies.
 */
public final class RequestUtil {

  private static final Log log = LogFactory.getLog(RequestUtil.class);

  /**
   * Checkstyle rule: utility classes should not have public constructor
   */
  private RequestUtil() {
  }

  /**
   * Convenience method to set a cookie
   *
   * @param response the current response
   * @param name the name of the cookie
   * @param value the value of the cookie
   * @param path the path to set it on
   */
  public static void setCookie(HttpServletResponse response, String name,
                               String value, String path) {
    if (log.isDebugEnabled()) {
      log.debug("Setting cookie '" + name + "' on path '" + path + "'");
    }

    Cookie cookie = new Cookie(name, value);
    cookie.setSecure(false);
    cookie.setPath(path);
    cookie.setMaxAge(3600 * 24 * 30); // 30 days

    response.addCookie(cookie);
  }

  /**
   * Convenience method to get a cookie by name
   *
   * @param request the current request
   * @param name the name of the cookie to find
   * @return the cookie (if found), null if not found
   */
  public static Cookie getCookie(HttpServletRequest request, String name) {
    Cookie[] cookies = request.getCookies();
    Cookie returnCookie = null;

    if (cookies == null) {
      return returnCookie;
    }

    for (final Cookie thisCookie : cookies) {
      if (thisCookie.getName().equals(name) &&
          !"".equals(thisCookie.getValue())) {
        returnCookie = thisCookie;
        break;
      }
    }

    return returnCookie;
  }

  /**
   * Convenience method for deleting a cookie by name
   *
   * @param response the current web response
   * @param cookie the cookie to delete
   * @param path the path on which the cookie was set (i.e. /appfuse)
   */
  public static void deleteCookie(HttpServletResponse response,
                                  Cookie cookie, String path) {
    if (cookie != null) {
      // Delete the cookie by setting its maximum age to zero
      cookie.setMaxAge(0);
      cookie.setPath(path);
      response.addCookie(cookie);
    }
  }

  /**
   * Convenience method to get the application's URL based on request
   * variables.
   *
   * @param request the current request
   * @return URL to application
   */
  public static String getAppURL(HttpServletRequest request) {
    if (request == null) {
      return "";
    }

    StringBuffer url = new StringBuffer();
    int port = request.getServerPort();
    if (port < 0) {
      port = 80; // Work around java.net.URL bug
    }
    String scheme = request.getScheme();
    url.append(scheme);
    url.append("://");
    url.append(request.getServerName());
    if ((scheme.equals("http") && (port != 80)) ||
        (scheme.equals("https") && (port != 443))) {
      url.append(':');
      url.append(port);
    }
    url.append(request.getContextPath());
    return url.toString();
  }
}
